...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine ecology progress series >Cue hierarchy and foraging in calanoid copepods: ecological implications of oceanographic structure
【24h】

Cue hierarchy and foraging in calanoid copepods: ecological implications of oceanographic structure

机译：颅骨co足类的提示层次和觅食：海洋结构的生态意义

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Fine-scale water column structure was mimicked in a laboratory plane jet flume to examine responses of the calanoid copepods Temora longicornis and Acartia tonsa to layers consisting of a velocity gradient, density gradient, phytoplankton exudates and food (phytoplankton). Cope-pods were exposed to isolated layers and combinations of cues as defined by in situ conditions. Behaviors elicited by the velocity gradient and chemical exudate layers included increased swimming speed and turn frequency consistent with excited area-restricted search behavior, which led to increased proportional residence time in the layers. Both species had significant responses to isolated layers of velocity gradients and chemical exudates, with T. longicornis responding more intensely to chemical cues than velocity gradients and A. tonsa responding equally to both. Combined fluid mechanical and chemical cues elicited species-specific responses. For T. longicornis, chemical presence induced responses that strengthened or cancelled initial reactions to the velocity gradient. These results suggest a cue hierarchy where a velocity gradient acts as an initial cue for narrowing search regions, and chemical cues and food presence determine consequent responses. For A. tonsa, combining velocity gradient and chemical cues had the same effect on copepod behavior as the individual cues, which suggests both cues are equal sources of information but are not closely associated. In both species, physical contact with particles or cells initiated feeding behavior, resulting in lower swimming speeds. Fluid density had a potentially aversive effect, as neither species responded with an area-restricted search response and individuals rarely crossed a strong density gradient. Observed behaviors may lead to aggregation, especially when superimposed on rhythmic movements such as diel vertical migration.
机译：在实验室平面喷气水槽中模拟了细尺度的水柱结构，以检查cal足类T足类天牛和and螨对由速度梯度，密度梯度，浮游植物渗出物和食物（浮游植物）组成的层的响应。将上等豆荚暴露于原位条件所定义的隔离层和线索组合。由速度梯度层和化学渗出层引起的行为包括增加的游泳速度和转向频率，与受激发区域限制的搜索行为一致，这导致在层中的比例停留时间增加。两种物种对孤立的速度梯度和化学渗出物层均具有显着响应，其中T. longicornis对化学线索的反应比速度梯度更强烈，而A.tonsa对两者的响应均相同。结合流体力学和化学线索引起物种特异性的反应。对于T. longicornis，化学物质的存在引起的反应增强或抵消了对速度梯度的初始反应。这些结果表明了提示层次，其中速度梯度充当了缩小搜索区域的初始提示，化学提示和食物的存在决定了相应的响应。对于A.tonsa，结合速度梯度和化学提示对co足类行为的影响与单个提示相同，这表明这两个提示是相同的信息源，但联系不紧密。在这两个物种中，与颗粒或细胞的物理接触都会引发觅食行为，从而导致游泳速度降低。流体密度具有潜在的反感作用，因为这两种物种都不会对区域限制的搜索响应做出反应，并且个体很少会越过强密度梯度。观察到的行为可能导致聚集，尤其是当叠加在有节奏的运动（如diel垂直迁移）上时。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号